搜题
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第1题

If you can not get away ______ yourself, it is of great importance to hang something out of the window to attract atte
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第2题

Cover your mouth ______ a wet towel or cloth, and avoid getting into the smoke.
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第3题

The majority of the u.s population is of European _______.
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第4题

No one knows for sure when a fire will happen, so it is _____ (extreme) necessary to make preparations before a fire s
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